CN103850850B - Detect the flowmeter of the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system - Google Patents
Detect the flowmeter of the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system Download PDFInfo
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- CN103850850B CN103850850B CN201410030529.8A CN201410030529A CN103850850B CN 103850850 B CN103850850 B CN 103850850B CN 201410030529 A CN201410030529 A CN 201410030529A CN 103850850 B CN103850850 B CN 103850850B
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Abstract
Technical problem to be solved by this invention is, provides the flowmeter detected for diesel engine high-pressure co-rail system oil sprayer circulating fuel injection quantity that a kind of structure is simple, measure accurately, be not subject to oil temperature variable effect.The present invention includes flowmeter valve block, flowtube and control unit, the side of flowmeter valve block is provided with two-way electromagnetic valve, and two-way electromagnetic valve and control unit electrical connection, on flowmeter valve block, the opposite side relative with two-way electromagnetic valve is provided with oil connection, oil connection is for connecting the jet of oil sprayer, described flowmeter valve block inside is provided with cavity, the bottom of flowmeter valve block is connected with sensor connecting sleeve, sensor connecting sleeve inside is provided with pressure transducer, pressure transducer is communicated with by sensor connecting sleeve with the cavity of flowmeter valve block inside, and pressure transducer is also electrically connected with the control unit of flowmeter.
Description
Technical field
The present invention relates to a kind of flowmeter, this flowmeter is applicable to the detection oil sprayer on diesel high pressure common rail fuel system being carried out to circulating fuel injection quantity.
Background technique
Diesel engine high-pressure co-rail oil spout technology is the diesel fuel injection system of current technological precedence, be characterized in the energy-saving and emission-reduction that can be realized diesel engine by it to the accurately control and regulation of injection pressure, fuel injection quantity, injection timing expeditiously, the diesel engine for automobile having 60% in Europe have employed high pressure co-rail system, and medium-heavy automobile nearly all adopts high-pressure common-rail injection system.Critical component in high-pressure common-rail injection system is the oil sprayer playing fuel oil jet-action, the performance of oil sprayer determines the performance of whole high pressure co-rail system, and be exactly whether oil sprayer circulating fuel injection quantity can reach appointment numerical value to the evaluation criterion of oil sprayer quality, circulating fuel injection quantity refers to that (usual oil sprayer oil spout is for 10 times a circulation in oil sprayer one circulation, concrete number of times is different and different according to oil sprayer specification, but is usually greater than 10 ability as a circulation) volume of fuel oil that sprays.Because each circulating fuel injection quantity is little, such as diesel engine for automobile is generally 300-500mm3/ circulation to the maximum, therefore the fuel injection quantity surveying single is very difficult, still continuous several times is sprayed at present, ask repeatedly the Cumulate Sum of fuel injection quantity, and then divided by the number of times of continuous injection, obtain average every circulating fuel injection quantity.
The test stand of existing mechanical type injection system, the Cumulate Sum adopting glass cylinder to survey multi-injection mostly, then the with the naked eye height of liquid level in graduated cylinder, due to viscosity, the surface tension of fuel oil, liquid level forms recessed meniscus, to contain reading numerical values bottom oily recessed meniscus in graduated cylinder during reading, but the observation of the naked eyes of people has error, probably at 0.5-1mm.Now, the test stand of some high-pressure common-rail injection systems of domestic-developed development still adopts this way to survey the fuel injection quantity of oil sprayer, is obviously relatively backward.
In addition, can also weight method be adopted, adopt the electronic scale that precision comparison is high, this method is more much better than glass cylinder gross visualization, but after each experiment, needs manually by the fuel oil turned letter in electronic scale oil holder, put back to again on electronic scale after oil holder is clean, complex operation.
If adopt oval gear flowmeter or positive discharge capacity gear meter, because the rotation of this kind of flowmeter internal gear needs certain pressure difference, namely the fuel oil of the inlet/outlet of flowmeter will have certain pressure difference just can to turn by driving wheel tooth spiral, and then the fuel flow of flowmeter is flow through in metering.But the pressure of fuel oil after fog dispersal of actual fuel injection device ejection is very little, and therefore adopt in this way, the requirement of flow meter is very high.First, the driving torque of flowmeter is very little, and the pressure difference also namely imported and exported is little as much as possible; The gear teeth will maintain stable rotation, also corresponding gap will be had between the end face of the gear teeth and the housing of flowmeter, this gap is too little, the thrust of the gear teeth will strengthen, and this gap is too large, can cause large leakage again, this must affect the precision of metering, therefore the requirement on machining accuracy of this kind of flowmeter is very high, at present the domestic product that there is no maturation, and imported product is expensive.
Summary of the invention
Technical problem to be solved by this invention is, provide low, consuming time short, the structure of a kind of cost simple, measure accurate, easy and simple to handle, not by the flowmeter of the oil sprayer circulating fuel injection quantity of the detection diesel engine high-pressure co-rail system of oil temperature variable effect.
For solving the problems of the technologies described above, the present invention adopts following technological scheme:
A kind of flowmeter detecting the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system, include flowmeter valve block, flowtube and control unit, the inside of flowmeter valve block is provided with cavity, the side of flowmeter valve block is fixed with two-way electromagnetic valve, a pipeline of two-way electromagnetic valve stretches in cavity, another pipeline of two-way electromagnetic valve reaches flowmeter valve block and is also communicated with the fuel tank of diesel engine high-pressure co-rail system outward, and two-way electromagnetic valve is also electrically connected with control unit; On flowmeter valve block, the opposite side relative with two-way electromagnetic valve is fixed with oil connection, one end of oil connection is stretched in cavity, the other end of oil connection is communicated with the jet of oil sprayer, the bottom of described flowmeter valve block is connected with sensor connecting sleeve, sensor connecting sleeve has inner chamber, the cavity connects of inner chamber and flowmeter valve block, and be placed with pressure transducer in inner chamber, pressure transducer is also electrically connected with control unit; Described flowtube be located at flowmeter valve block top and with the cavity connects of flowmeter valve block.When oil sprayer starts, the fuel oil that oil sprayer sprays by oil connection imports in the cavity of flowmeter valve block, now control unit controls two-way electromagnetic valve closedown, fuel oil is accumulated in cavity and flowtube, for the effect of gravity, fuel oil is exerted pressure to the pressure transducer below it, be pressure according to P=ρ gh(P, ρ is the density of fuel oil, g is gravity accleration, h is the height that fuel oil accumulates in the cavities) formula, ρ, g is known, the pressure P that control unit records according to pressure transducer can be regarded as to obtain the height h that accumulates in cavity and flowtube of fuel oil, because the area of contact s of pressure transducer and fuel oil also determines, be the volume of fuel oil according to V=sh(V, s is the area of contact of pressure transducer and fuel oil, h is the height that fuel oil accumulates in cavity and flowtube) formula, control unit can calculate the volume of accumulated fuel oil, the volume of measured fuel oil can be known divided by the number of times of oil sprayer oil spout the fuel injection quantity that oil sprayer is each, number of times fuel injection quantity each for oil sprayer being multiplied by the oil spout that often circulates can learn the fuel injection quantity that oil sprayer often circulates.The parts that this flowmeter uses are conventional hardware on sale on market, cheap; Flowmeter internal structure is simple; The control unit of flowmeter can calculate the circulating fuel injection quantity of oil sprayer fast.
Preferably, the side of described flowmeter valve block is also fixed with temperature transducer, and one end of temperature transducer extend in the cavity of flowmeter valve block, and temperature transducer is also electrically connected with control unit.Temperature transducer can detect the oil temperature of the fuel oil accumulated in the cavity of flowmeter valve block in real time, at different temperatures, fuel density is different, so control unit can know the density of the fuel oil accumulated in the cavity of flowmeter valve block in real time by measured fuel oil temperature, thus make the impact that flow rate calculation accurately, is not changed by fuel oil temperature.
Preferably, described pressure transducer bottom is provided with clamping sleeve pressure transducer being fixed on sensor connecting sleeve inside.
Preferably, seal ring is provided with between described oil connection and flowmeter valve block.Seal ring can prevent the fuel leakage accumulated in flowmeter valve block, further increases the accuracy that flowmeter detects.
Preferably, seal ring is provided with between described sensor connecting sleeve and flowmeter valve block.Seal ring can prevent the fuel leakage accumulated in flowmeter valve block, further increases the accuracy that flowmeter detects.
Preferably, described temperature transducer and flowmeter valve interblock are provided with seal ring.Seal ring can prevent the fuel leakage accumulated in flowmeter valve block, further increases the accuracy that flowmeter detects.
After adopting above structure, its technique effect produced is obvious: the accurate detection that can be realized the oil sprayer circulating fuel injection quantity to diesel engine high-pressure co-rail system by cheap simple component at short notice, and not by the impact of oil temperature change.
Accompanying drawing explanation
Fig. 1 is stravismus structural representation of the present invention.
Fig. 2 is main TV structure schematic diagram of the present invention.
Fig. 3 is right TV structure schematic diagram of the present invention.
Fig. 4 is the cutting structural representation after Fig. 3 of the present invention cuts open by A-A direction.
Wherein, 1, flowmeter valve block, 1.1 cavitys, 2, flowtube, 3, two-way electromagnetic valve, 4, oil connection, 5, sensor connecting sleeve, 5.1, inner chamber, 6, pressure transducer, 7, temperature transducer, 8, clamping sleeve, 9, seal ring.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.
As shown in Fig. 1, Fig. 3, Fig. 4, the present invention is provided with flowmeter valve block 1, and oil connection 4 is equipped with in the side of flowmeter valve block 1, and oil connection 4 is communicated with the jet (not shown) of the required oil sprayer detected; The opposite side that flowmeter valve block 1 is relative with oil connection 4 is equipped with two-way electromagnetic valve 3.Twoway valves is fluid control component term, refers to the control valve with two pipelines, two-way electromagnetic valve, and this valve is equivalent to replace manpower to realize the break-make of valve with electromagnetism, is applicable to being applied in automatic production.A pipeline of two-way electromagnetic valve 3 extend in cavity 1.1, and another pipeline of two-way electromagnetic valve 3 stretches out flowmeter valve block 1 and is communicated with the fuel tank of diesel engine high-pressure co-rail system, and two-way electromagnetic valve 3 controls by the control unit of flowmeter.When flowmeter detects, control unit controls two-way electromagnetic valve 3 and closes, and after flowmeter detection terminates, control unit controls two-way electromagnetic valve 3 and discharged by the fuel oil accumulated in flowmeter valve block 1.The opposite side of flowmeter valve block 1 is also provided with temperature transducer 7; The top of flowmeter valve block 1 is provided with flowtube 2, and flowtube 2 is communicated with cavity 1.1; The bottom of flowmeter valve block 1 is fixedly connected with sensor connecting sleeve 5, and the bottom of sensor connecting sleeve 5 is provided with clamping sleeve 8, and pressure transducer 6 is fixed in the inner chamber 5.1 of sensor connecting sleeve 5 by clamping sleeve 8, and inner chamber 5.1 is communicated with cavity 1.1.
As shown in Figure 3, Figure 4, the inside of flowmeter valve block 1 is provided with cavity 1.1, flowtube 2, two-way electromagnetic valve 3, oil connection 4, sensor connecting sleeve 5 are all communicated with cavity 1.1 near one end of flowmeter valve block 1, temperature transducer 7 stretches in cavity 1.1, the inside of sensor connecting sleeve 5 has inner chamber 5.1, be provided with pressure transducer 6 in inner chamber 5.1, inner chamber 5.1 is communicated with cavity 1.1.
As described in Figure 2, oil connection 4, temperature transducer 7, be all respectively equipped with seal ring 9 between sensor connecting sleeve 6 and flowmeter valve block 1.
After flowmeter connects the jet of oil sprayer, drive oil sprayer commencement of fuel injection, the fuel oil of oil sprayer ejection flows into via oil connection 4 and is accumulated in the cavity 1.1 of flowmeter valve block 1 inside, after cavity 1.1 is full of by the fuel oil that oil sprayer continuous several times sprays, oil is upwards accumulated in the flowtube 2 be communicated with cavity 1.1 further, described pressure transducer 6 to be located at below cavity 1.1 and to be communicated with cavity 1.1, pressure transducer 6 is also connected (not shown) with control unit electrical signal, pressure measured by pressure transducer 6 is caused by the oil accumulated in cavity above it 1.1 and in flowtube 2, according to physical equation P=ρ gh, pressure P equals density p, the product of gravity acceleration g and height h, when detecting, the density p of the fuel oil that oil sprayer sprays and gravity acceleration g are known, when pressure P is detected, control unit can calculate the height h of the oil of accumulation above pressure transducer 6, and the basal area s that pressure transducer 6 contacts with oil is the value determined, therefore according to physical equation V=sh, volume V equals the product of basal area s and height h, control unit can to calculate further in cavity 1.1 and in flowtube 2 the volume V of fuel oil that adds up, again in conjunction with the number of times of oil sprayer oil spout, (usual oil sprayer oil spout 10 times is as a circulation can to calculate the fuel injection quantity of tested oil sprayer one circulation immediately, it is different according to oil sprayer specification difference that concrete oil spout how many times calculates a circulation), the parts that whole device uses are the cheap conventional products that market can be purchased, whole apparatus structure is simple, easy and simple to handle, computing is consuming time short.The front portion of flowmeter valve block 1 is also provided with temperature transducer 7, because temperature transducer 7 stretches in cavity 1.1, therefore temperature transducer 7 can to record in cavity 1.1 the temperature of fuel oil that adds up, and temperature transducer 7 is connected (not shown) with control unit electrical signal, the density p of fuel oil affects very large by oil temperature, Real-Time Monitoring oil temperature can guarantee that control unit uses correct fuel density ρ to calculate the volume of fuel oil, therefore this device flowmeter does not affect by oil temperature, all correct circulating fuel injection quantity can be calculated when arbitrary oil temperature.After detection terminates, control unit controls two-way electromagnetic valve 3 and is discharged by the oil in flowtube 2 and cavity 1.1.
By simple structure with low cost above, the present invention is easy and simple to handle, can realize the accurate detection of the oil sprayer circulating fuel injection quantity to diesel engine high-pressure co-rail system at short notice, and not by the impact of oil temperature change.
The above embodiment of the present invention can not be used for limiting the present invention to explanation of the present invention, and any change in the implication suitable with claims of the present invention and scope, all should think to be included in the scope of claims.
Claims (6)
1. one kind is detected the flowmeter of the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system, include flowmeter valve block (1), flowtube (2) and control unit, the inside of flowmeter valve block (1) is provided with cavity (1.1), the side of flowmeter valve block (1) is fixed with two-way electromagnetic valve (3), a pipeline of two-way electromagnetic valve (3) stretches in cavity (1.1), another pipeline of two-way electromagnetic valve (3) reaches flowmeter valve block (1) and is also communicated with the fuel tank of diesel engine high-pressure co-rail system outward, two-way electromagnetic valve (3) is gone back and control unit electrical connection, the upper opposite side relative with two-way electromagnetic valve (3) of flowmeter valve block (1) is fixed with oil connection (4), one end of oil connection (4) is stretched in cavity, the other end of oil connection (4) is communicated with the jet of oil sprayer, it is characterized in that: the bottom of described flowmeter valve block (1) is connected with sensor connecting sleeve (5), sensor connecting sleeve (5) has inner chamber (5.1), inner chamber (5.1) is communicated with the cavity (1.1) of flowmeter valve block (1), and be placed with pressure transducer (6) in inner chamber (5.1), pressure transducer (6) is also electrically connected with control unit, described flowtube (2) is located at the top of flowmeter valve block (1) and is communicated with the cavity (1.1) of flowmeter valve block (1).
2. the flowmeter detecting the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system as claimed in claim 1, it is characterized in that: the side of described flowmeter valve block (1) is also fixed with temperature transducer (7), and one end of temperature transducer (7) extend in the cavity (1.1) of flowmeter valve block (1), temperature transducer (7) is gone back and control unit electrical connection.
3. the flowmeter detecting the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system as claimed in claim 1 or 2, is characterized in that: described pressure transducer (6) bottom is provided with and pressure transducer (6) is fixed on the inner clamping sleeve (8) of sensor connecting sleeve (5).
4. the flowmeter detecting the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system as claimed in claim 1, is characterized in that: be provided with seal ring (9) between described oil connection (4) and flowmeter valve block (1).
5. the flowmeter detecting the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system as claimed in claim 1, is characterized in that: be provided with seal ring (9) between described sensor connecting sleeve (5) and flowmeter valve block (1).
6. the flowmeter detecting the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system as claimed in claim 2, is characterized in that: be provided with seal ring (9) between described temperature transducer (7) and flowmeter valve block (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410030529.8A CN103850850B (en) | 2014-01-23 | 2014-01-23 | Detect the flowmeter of the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410030529.8A CN103850850B (en) | 2014-01-23 | 2014-01-23 | Detect the flowmeter of the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system |
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| CN103850850A CN103850850A (en) | 2014-06-11 |
| CN103850850B true CN103850850B (en) | 2016-04-06 |
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| CN201410030529.8A Expired - Fee Related CN103850850B (en) | 2014-01-23 | 2014-01-23 | Detect the flowmeter of the oil sprayer circulating fuel injection quantity of diesel engine high-pressure co-rail system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109882331B (en) * | 2019-02-28 | 2020-11-13 | 一汽解放汽车有限公司 | Long needle valve fuel sprayer mating parts high pressure flow measuring device |
| CN111828220B (en) * | 2020-07-16 | 2022-03-25 | 南通职业大学 | Performance testing device and measuring method for oil inlet metering valve of common rail pump |
| CN113153601B (en) * | 2021-05-08 | 2022-06-28 | 重庆红江机械有限责任公司 | Stabilizing device convenient for measuring oil injection quantity of oil injector |
| CN113790119B (en) * | 2021-10-09 | 2022-06-10 | 重庆红江机械有限责任公司 | Oil sprayer testing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2727432Y (en) * | 2004-05-18 | 2005-09-21 | 河南科技大学 | Test stand for automatically measuring oil mass of injection pump |
| CN201285295Y (en) * | 2008-11-11 | 2009-08-05 | 河南科技大学 | Condenser type fuel injection amount detection sensor |
| CN102889158A (en) * | 2012-10-12 | 2013-01-23 | 机科发展科技股份有限公司 | Single injection quantity detector of common rail oil injector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999067617A1 (en) * | 1998-06-23 | 1999-12-29 | H.R. Krueger Machine Tool, Inc. | Flowmeter |
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2014
- 2014-01-23 CN CN201410030529.8A patent/CN103850850B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2727432Y (en) * | 2004-05-18 | 2005-09-21 | 河南科技大学 | Test stand for automatically measuring oil mass of injection pump |
| CN201285295Y (en) * | 2008-11-11 | 2009-08-05 | 河南科技大学 | Condenser type fuel injection amount detection sensor |
| CN102889158A (en) * | 2012-10-12 | 2013-01-23 | 机科发展科技股份有限公司 | Single injection quantity detector of common rail oil injector |
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